U.S. imports of Dividing Heads & Special Attachments for Machine Tools (HS 846630) totaled $8.8M in August 2026, imported from 43 countries.
Importers of Dividing Heads & Special Attachments for Machine Tools paid $1.1M in duties in August 2026, an average duty rate of 12.51% — duty actually collected as a share of the imports that cleared customs, not the published tariff schedule.
Last updated: August 2026 dataDividing heads (8466301000) — indexing devices that rotate a workpiece to precise angular positions — and the broader category of special machine-tool attachments serve gear hobbing, milling, and grinding operations across precision manufacturing. Germany leads US imports under this heading, consistent with its dominance in high-accuracy machine-tool accessories, with Canada, Taiwan, Japan, and Italy also significant sources. The US schedule separates dividing heads from woodworking-machine attachments (8466306040), general machine attachments (8466306085), and NESOI attachments (8466308000), so the intended host machine type is the primary classification driver. Importers of CNC rotary tables and indexing fixtures should confirm whether the device qualifies as a dividing head or falls under the broader attachment lines.
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534 import shipments a month
A traditional dividing head provides manual or semi-automatic angular indexing. A fully programmable CNC rotary table may be classified as a special attachment (8466306085 or 8466308000) rather than a dividing head, depending on its design and the degree of integration with the host machine's control system. A binding ruling from CBP is advisable for high-value CNC rotary units where the distinction is not clear-cut.
Yes. The US tariff schedule under this heading specifically breaks out attachments for woodworking machine tools (8466306040) from those for other machine tools (8466306085 and 8466308000). The nature of the host machine — woodworking versus metalworking or other — is therefore the first classification question an importer must resolve.
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Subheading 6 of 7 in heading 8466
Subheading 846630 · $8.8M of $342.0M
HS10 import codes under this HS6 parent, each with its own page. Source: U.S. Harmonized Tariff Schedule.
| Code | Description | Imports for consumption | Average duty rate | Dutiable Share | Duty Collected |
|---|---|---|---|---|---|
| 8466306085 | Machines As Special Attachments for Machine Tools | $4.7M | 12.66% | 98.62% | $595K |
| 8466308000 | Spec Attach, NESOI, For Mach Tools | $2.1M | 14.36% | 86.19% | $297K |
| 8466306040 | Special Attchmnts for Wdwrking Mach Tools | $1.2M | 9.68% | 65.52% | $119K |
| 8466301000 | Dividing Heads for Machine Tools | $843K | 11.20% | 96.83% | $94K |
HS10 export codes under this HS6 parent, each with its own page. Source: U.S. Schedule B export classification.
Import lines come from the U.S. Harmonized Tariff Schedule and export lines from Schedule B. The two are numbered by different agencies, so the same 10-digit code can appear in both tables describing a different product.
Imports · August 2026
origin
Japan pays 12.7% duty; Canada 0.2%.
customs district
entry
rate provision · imports
9.0% enters free of duty; duty collected equals 12.51% of imports for consumption.
ImportsExports
Imports
$8.8MYoY · free account
Exports
$10.0MYoY · free account
12-mo low · imports
Low · free accountOver the twelve months to August 2026, the U.S. imported $104.9M of Dividing Heads & Special Attachments for Machine Tools and exported $104.3M.
Through August 2026. Source: U.S. Census Bureau.